Suspension apparatus for through-the-bit logging and assembly method

Abstract

The application discloses a suspension device for over-drill head logging and an assembling method thereof. The device comprises a double female joint, opposite open screw sleeves connected to two ends of the double female joint, an upper joint and a TBL drill bit connected to the opposite open screw sleeves respectively, and a suspension seat movably connected in the double female joint. When the double female joint rotates, the suspension seat remains stationary. The method comprises the following steps: firstly, assembling the TBL drill bit; secondly, installing a supporting bearing at one end of the suspension seat; thirdly, assembling the TBL drill bit and the suspension seat with the supporting bearing installed at one end; and fourthly, accommodating the TBL drill bit in the double female joint. The upper joint is assembled with the other end of the double female joint by repeating the above steps, and then silicon grease is injected into the annular space. The application solves the problem that the existing technology causes the suspension seat to rotate when the drill rod rotates, thereby causing the logging instrument string to rotate, resulting in the breakage of the logging instrument, the falling of the radioactive source into the well and other logging engineering accidents.

Description

Technical Field

[0001] This invention belongs to the field of drill bit logging technology, specifically relating to a suspension device for drill bit logging, and also to a method for assembling the suspension device. Background Technology

[0002] Through-the-bit logging (TBL) is widely used in the logging industry for oil and gas exploration. Its main process steps are as follows: First, a specially designed TBL suspension device is connected to the bottom of the drill pipe. After drilling to the target logging depth, the logging instrument string connected to the lower end of the cable is lowered into the drill pipe's water hole from the wellhead. The cable is then lowered, and with the help of gravity and high-pressure drilling mud, the measuring instrument in the lower part of the instrument string passes through the suspension device and is secured to the upper end of the suspension device's suspension seat by the suspension ball seat of the upper suspension section. After confirming that the measuring instrument is working properly, a command is sent to the instrument through a dedicated device to separate the cable from the instrument string, and then the cable is retrieved. After the cable is retrieved, the drill pipe is raised, and the measuring instrument suspended at the lower end of the drill pipe measures the wellbore shape, formation information, etc.

[0003] For over-the-bit logging (TBL) technology, the ideal wellbore condition is one where the drill pipe can be directly pulled up for logging operations. However, due to geological target selection, formation characteristics, and other factors, many oil and gas wells have S-shaped wellbore structures and uneven well walls, requiring the drill pipe to be rotated during tripping. To reduce damage to logging instruments caused by drill pipe rotation, current technology typically involves installing a rotating sub between the suspension sub and the logging instrument. When using TBL, the logging instrument string is secured to the upper end of the suspension mount via a suspension ball seat mounted on the outside of the suspension sub. During tripping, the weight of the instrument string and the friction between the instrument string and the well wall act on the suspension ball.

[0004] Because the existing suspension system's suspension seat and double female connector are fixed by threads, the suspension system usually drives the suspended sub to rotate when the drill pipe is rotated. Due to the obstruction of wellbore mud and cuttings, the influence of the wellbore trajectory, or the reduced reliability of the rotating sub itself, there is a risk that the rotating sub will not rotate during logging operations. Once the rotating sub in the instrument string fails, the drill pipe will drive the logging instrument string to rotate. Since the instrument string is not suspended in the wellbore, it will rub and collide with the well wall during rotation, leading to logging accidents such as instrument breakage and radioactive sources falling into the well. Summary of the Invention

[0005] The purpose of this invention is to provide a suspension device for over-the-bit logging, which solves the problem in the prior art where the rotation of the drill pipe causes the suspension seat to rotate, which in turn causes the logging instrument string to rotate, leading to logging engineering accidents such as logging instrument breakage and radioactive source falling into the well.

[0006] Another object of the present invention is to provide an assembly method for a suspension device for over-the-bit logging.

[0007] The first technical solution adopted in this invention is a suspension device for logging through a drill bit, including a double female connector. Both ends of the double female connector are connected to split threaded sleeves by threads. The two ends of the double female connector are respectively connected to an upper connector and a TBL drill bit by split threaded sleeves. The surfaces of the upper connector and the TBL drill bit are respectively provided with inserting annular grooves that cooperate with the split threaded sleeves along their own circumference. The split threaded sleeves at both ends are located in the corresponding inserting annular grooves to realize the connection between the upper connector and the TBL drill bit and the double female connector.

[0008] The double female connector has a movable suspension seat inside. Support bearings are respectively sleeved on the outer side wall of the suspension seat near both ends. The outer ring of the support bearing is fixed to the inner wall of the double female connector. When the double female connector rotates, the suspension seat remains stationary.

[0009] The first technical solution of the present invention is further characterized in that,

[0010] The split threaded sleeve is an annular sleeve composed of a pair of arc-shaped pieces. The pair of arc-shaped pieces are connected by bolts. The outer side of the split threaded sleeve is provided with external threads for connection with the double female connector. A pair of slots are opened on the outer circumference of the split threaded sleeve and the mating end of the upper connector or TBL drill bit. The pair of slots are symmetrically arranged along the axis of the split threaded sleeve.

[0011] A locking ring is provided between the split threaded sleeve and the connecting end face of the upper connector or TBL drill bit. A pair of inserts that mate with the insert groove are vertically fixed on the outer circumference of the locking ring. The pair of inserts are symmetrically arranged along the axis of the locking ring.

[0012] The upper connector or TBL drill bit has a pair of slots along its own axis at one end relative to the anti-reverse ring, and the anti-reverse ring is bent and embedded in the slots relative to the slots.

[0013] A pair of slots and a pair of inserts are staggered along the circumference of the device.

[0014] The inner sides of both ends of the double female connector have grooves that pass through the internal thread surface along the axial direction. The outer circumference of the upper connector and the TBL drill bit connected to the double female connector are respectively fixed with protruding keys, and the protruding keys and grooves are adapted to each other.

[0015] A protective bearing is installed in the diameter-increasing area above the central water inlet of the TBL drill bit. The TBL drill bit is threadedly connected to a protective bearing sleeve, which restricts the axial movement of the protective bearing. In addition, a load-bearing bearing is also installed at the central water inlet of the TBL drill bit, and the load-bearing bearing is in contact with the lower end face of the suspension seat.

[0016] The two ends of the suspension seat are respectively threaded with support bearing sleeves, and the support bearing sleeves are tightly pressed against the support bearings;

[0017] An annular space is formed between the suspension seat and the double female connector. The annular space is located between the two end support bearings. The double female connector has a grease injection hole at the position opposite to the annular space.

[0018] The second technical solution adopted in this invention is an assembly method for a suspension device for over-the-bit logging. First, the TBL drill bit is assembled. Then, a support bearing is installed at one end of the suspension seat. The TBL drill bit and the suspension seat with the support bearing at one end are assembled. After assembly, the interconnected TBL drill bit and suspension seat are housed inside the double female connector.

[0019] Repeat the above process to assemble the top connector and the other end of the double female connector. After assembly, inject silicone grease into the annular space through the grease injection hole.

[0020] The second technical solution of the present invention is further characterized in that,

[0021] The specific steps are as follows:

[0022] Step 1: Install the protective bearing in the diameter-increasing area above the center water hole of the TBL drill bit. Tighten the protective bearing by using the threaded connection between the protective bearing sleeve and the TBL drill bit. Then, fix the load bearing in the center water hole of the TBL drill bit.

[0023] The split threaded sleeve is fitted into the inserting ring groove of the TBL drill bit. The anti-reverse ring is placed between the mating end faces of the split threaded sleeve and the TBL drill bit. The anti-reverse ring is adjusted so that the insert on the anti-reverse ring is aligned with the insert groove on the split threaded sleeve and partially embedded in the insert groove. Then, the two arc-shaped pieces of the split threaded sleeve are positioned by the locating pin and fixed by bolts.

[0024] Step 2: Fit the support bearing sleeve onto one end of the suspension seat, and tighten it by screwing the support bearing sleeve into the suspension seat to fix the support bearing on the suspension seat.

[0025] Step 3: Align the end of the suspension seat with the support bearing that has been assembled in the previous step with the corresponding connecting end of the TBL drill bit that has been assembled in the previous step, and place the support bearing on the connecting end of the TBL drill bit, and then mount the lower end face of the suspension seat on the bearing.

[0026] Step 4: Install the double female connector onto the suspension seat and TBL drill bit, so that the suspension seat is housed inside the double female connector. At the same time, rotate and adjust the double female connector so that the groove on the double female connector is aligned with the protrusion on the TBL drill bit, and the groove fits into the protrusion. Then, rotate the split threaded sleeve relative to the double female connector and TBL drill bit to fix the TBL drill bit to the double female connector.

[0027] Step 5: Fit the other support bearing from the port of the double female connector onto the other end of the suspension seat. Similarly, use the threaded engagement between the support bearing sleeve and the suspension seat to tighten and press, thus fixing the other support bearing onto the suspension seat.

[0028] Next, fit another set of split threaded sleeves into the insert groove on the upper connector. Place the anti-reverse ring between the mating end faces of the split threaded sleeve and the upper connector. Adjust the anti-reverse ring so that the insert on the anti-reverse ring is aligned with the insert groove on the split threaded sleeve and partially embedded in the insert groove. Then, position it with a locating pin and fix it with bolts to form a pair of arc-shaped pieces of the split threaded sleeve.

[0029] Step 6: Align the corresponding connection ends of the upper connector and the double female connector that have been assembled in the previous step, install the upper connector inside the double female connector, and rotate and adjust the upper connector so that the protruding key on the upper connector is aligned with the groove opened inside the double female connector, and the protruding key is fitted into the groove. Then rotate the split threaded sleeve relative to the double female connector and the TBL drill bit to fix the upper connector on the double female connector.

[0030] Step 7: Use external machinery to impact the positions where the insert and the slot are set, so that the ring surface of the anti-reverse ring undergoes plastic deformation that protrudes into the slot.

[0031] Step 8: Inject silicone grease into the annular space between the suspension seat and the double female connector through the grease injection hole. After filling, seal the grease injection hole with a silicone grease screw.

[0032] The beneficial effects of this invention are:

[0033] The suspension device for over-the-bit logging of the present invention utilizes a support bearing to support the suspension seat, which is then fixed inside the cylinder of a double-female connector. This allows the suspension seat to have rotational freedom relative to the double-female connector. When the double-female connector rotates with the drill pipe, the suspension seat and the logging instruments suspended on it will not rotate with it. This reduces the tendency of the logging instruments extending into the open hole to sway, avoids friction or even collision with the well wall that could damage the logging instruments, prevents logging accidents, enhances the stability and reliability of logging operations, improves logging efficiency, and reduces production costs. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the suspension device for logging through the drill bit according to the present invention;

[0035] Figure 2 for Figure 1 Sectional view of section AA;

[0036] Figure 3 for Figure 1 Sectional view of section BB;

[0037] Figure 4 This is an enlarged schematic diagram of point II in the suspension device for over-the-bit logging of the present invention;

[0038] Figure 5 This is an enlarged schematic diagram of point I in the suspension device for over-the-bit logging of the present invention.

[0039] In the diagram, 1. Upper connector, 2. Double female connector, 3. Split threaded sleeve, 4. Suspension seat, 5. Support bearing, 6. TBL drill bit, 7. Protective bearing, 8. Grease injection hole, 9. Anti-reverse ring, 10. Insert, 11. Slot, 12. Support bearing sleeve, 13. Protective bearing sleeve, 14. Load-bearing bearing, 15. Insert ring groove, 16. Insert groove, 17. Groove, 18. Raised key. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0041] Example 1

[0042] This invention relates to a suspension device for over-the-bit logging, such as... Figure 1 As shown, it includes a double female connector 2, both ends of which are threadedly connected to split threaded sleeves 3. Each split threaded sleeve 3 is an annular sleeve composed of a pair of arc-shaped pieces, which can be positioned by a locating pin and fixedly connected to the pair of arc-shaped pieces by connecting bolts. The outer side of the split threaded sleeve 3 has external threads for connection with the double female connector 2, such as... Figure 2 As shown, a pair of grooves 16 are provided on the outer circumferential surface of the split threaded sleeve 3 and the mating end of the upper connector 1 or TBL drill bit 6. The pair of grooves 16 are symmetrically arranged along the axis of the split threaded sleeve 3.

[0043] The two ends of the double female connector 2 are respectively connected to the upper connector 1 and the TBL drill bit 6 via split threaded sleeves 3. The surfaces of the upper connector 1 and the TBL drill bit 6 are both circumferentially grooved with inserting annular grooves 15 that mate with the split threaded sleeves 3. The split threaded sleeves 3 are placed in the inserting annular grooves 15. The axial displacement of the split threaded sleeves 3 is limited by the inserting annular grooves 15, but the split threaded sleeves 3 can rotate relative to the upper connector 1 or the TBL drill bit 6 in the inserting annular grooves 15. The purpose is to make the external thread of the split threaded sleeves 3 connect with the two ends of the double female connector 2 through threads, so that the upper connector 1 and the TBL drill bit 6 are respectively connected to the double female connector 2.

[0044] Furthermore, such as Figure 3As shown, the inner sides of both ends of the double female connector 2 are respectively provided with grooves 17 that pass through the internal thread surface along the axial direction. Raised keys 18 are fixed to the outer circumferential surfaces of the upper connector 1 and the TBL drill bit 6 at the connection ends with the double female connector 2. The cross-sectional structure of the raised keys 18 is compatible with the cross-sectional structure of the grooves 17. When the upper connector 1 and the TBL drill bit 6 are respectively connected to the double female connector 2, the raised keys 18 can be fitted into the grooves 17 at the corresponding ends, restricting the upper connector 1 and the TBL drill bit 6 from rotating relative to the double female connector 2.

[0045] The double female connector 2 is movably connected to a suspension seat 4. Support bearings 5 ​​are respectively sleeved on the outer side wall of the suspension seat 4 near both ends. The support bearings 5 ​​are rotating bearings. Support bearing sleeves 12 are threaded to both ends of the suspension seat 4. The support bearing sleeves 12 are tightly abutted against the support bearings 5.

[0046] like Figure 4 As shown, a protective bearing 7 is fitted into the increased diameter area above the central water inlet of the TBL drill bit 6. The TBL drill bit 6 is threadedly connected to a protective bearing sleeve 13, which restricts the axial movement of the protective bearing 7. The inner circumferential surface of the protective bearing sleeve 13 protrudes beyond the inner circumferential surface of the central water inlet of the TBL drill bit 6.

[0047] The support bearing 5 is fixed between the suspension seat 4 and the double female connector 2, and the outer ring of the support bearing 5 is fixed to the inner wall of the double female connector 2. When the double female connector 2 rotates, the suspension seat 4 remains stationary. The lower end of the suspension seat 4 is also provided with a load bearing 14, which is in contact with the lower end face of the suspension seat 4. The load bearing 14 is a thrust bearing and is fixed at the center water hole position of the TBL drill bit 6. The suspension seat 4 can be axially loaded onto the double female connector 2 through the load bearing 14 and the protective bearing sleeve 13.

[0048] Furthermore, an annular space is formed between the suspension seat 4 and the double female connector 2. The annular space is located between the two end support bearings 5, and the double female connector 2 has a grease injection hole 8 at the position opposite to the annular space. Silicone grease can be filled into the annular space through the grease injection hole 8 to protect the support bearing 5 and the load bearing 14 and improve the rotational efficiency of the support bearing 5 and the load bearing 14.

[0049] Example 2

[0050] Based on Example 1, such as Figure 5 As shown, in the suspension device for over-the-bit logging of the present invention, anti-reverse rings 9 are respectively provided between the connecting end faces of the split threaded sleeve 3 and the upper connector 1 or TBL drill bit 6. The outer circumference of the anti-reverse ring 9 has a pair of inserts 10 perpendicular to the plane of the ring plate, and the pair of inserts 10 are symmetrically arranged along the axis of the anti-reverse ring 9. The structure of the inserts 10 corresponds to and is fitted into the grooves 16 opened on the split threaded sleeve 3.

[0051] The upper connector 1 or the TBL drill bit 6 has a pair of slots 11 respectively on one end of the anti-reverse ring 9 along its own axial direction. The corresponding pair of slots 11 are symmetrically arranged on the circumferential end face of the upper connector 1 and the TBL drill bit 6. The pair of slots 11 and the pair of grooves 16 are staggered along the circumferential direction of the device of the present invention.

[0052] The anti-reverse ring 9 is bent and embedded in the slot 11 relative to the slot 11. Through the intermediate transition of the anti-reverse ring 9, the rotational movement of the split threaded sleeve 3 relative to the upper connector 1 and the TBL drill bit 6 is constrained and restricted.

[0053] Example 3

[0054] The assembly method of the suspension device for over-bit logging of the present invention adopts the above-mentioned suspension device for over-bit logging. First, the TBL drill bit 6 is assembled. Then, a support bearing 5 is installed at one end of the suspension seat 4. The TBL drill bit 6 and the suspension seat 4 with the support bearing 5 installed at one end are assembled. After the assembly is completed, the interconnected TBL drill bit 6 and suspension seat 4 are housed inside the double female connector 2.

[0055] Repeat the above process to assemble the other end of the upper connector 1 and the double female connector 2. After the assembly is completed, inject silicone grease into the annular space through the grease injection hole 8.

[0056] Example 4

[0057] The assembly method of the suspension device for through-bit logging of the present invention is specifically implemented according to the following steps:

[0058] Step 1: Take the TBL drill bit 6, the protective bearing 7, a backstop ring 9, and a pair of split threaded sleeves 3; fit the protective bearing 7 into the diameter-increasing area above the central water hole of the TBL drill bit 6, and use the threaded engagement between the protective bearing sleeve 13 and the TBL drill bit 6 to tighten and press the protective bearing 7, thereby locking and fixing the protective bearing 7 onto the TBL drill bit 6; then, fit the bearing 14 into the central water hole of the TBL drill bit 6.

[0059] The anti-reverse ring 9 is fitted onto the TBL drill bit 6, and the split threaded sleeve 3 is fitted into the insert groove 15 on the TBL drill bit 6. The anti-reverse ring 9 is placed between the mating end faces of the split threaded sleeve 3 and the TBL drill bit 6. The anti-reverse ring 9 is adjusted so that the insert 10 on the anti-reverse ring 9 is aligned with the insert groove 16 on the split threaded sleeve 3 and partially embedded in the insert groove 16. Then, the pair of arc-shaped pieces forming the split threaded sleeve 3 are positioned by the locating pin and fixed by bolts. The split threaded sleeve 3 is then connected and installed on the TBL drill bit 6.

[0060] Step 2: Take a suspension seat 4 and a support bearing 5, fit the support bearing 5 onto one end of the suspension seat 4, and use the threaded engagement between the support bearing sleeve 12 and the suspension seat 4 to tighten and press, thereby fixing the support bearing 5 onto the suspension seat 4.

[0061] Step 3. Align the end of the suspension seat 4 assembled in Step 2 with the corresponding connecting end of the TBL drill bit 6 assembled in Step 1, and place the supporting bearing 5 on the connecting end of the TBL drill bit 6. Then, mount the lower end face of the suspension seat 4 onto the bearing 14.

[0062] Step 4: Take the double female connector 2 and fit it onto the suspension seat 4 and TBL drill bit 6, so that the suspension seat 4 is housed inside the double female connector 2. At the same time, rotate and adjust the double female connector 2 so that the groove 17 on the double female connector 2 is aligned with the protruding key 18 on the TBL drill bit 6, and the groove 17 fits into the protruding key 18. Then, rotate the split threaded sleeve 3 relative to the double female connector 2 and TBL drill bit 6, and tighten the threaded engagement between the split threaded sleeve 3 and the double female connector 2 to fix the TBL drill bit 6 to the double female connector 2.

[0063] Step 5: Take another support bearing 5, upper connector 1, another anti-reverse ring 9 and another set of split threaded sleeves 3; fit the other support bearing 5 from the port of the double female connector 2 onto the other end of the suspension seat 4, and tighten the support bearing sleeve 12 with the threaded engagement of the suspension seat 4 to fix the support bearing 5 on the suspension seat 4.

[0064] The anti-reverse ring 9 is fitted onto the upper connector 1, and the split thread sleeve 3 is fitted into the inserting ring groove 15 opened on the upper connector 1. The anti-reverse ring 9 is placed between the mating end faces of the split thread sleeve 3 and the upper connector 1. The anti-reverse ring 9 is adjusted so that the insert 10 on the anti-reverse ring 9 is aligned with the insert groove 16 opened on the split thread sleeve 3 and is partially embedded in the insert groove 16. Then, the pair of arc-shaped pieces that make up the split thread sleeve 3 are positioned by the positioning pin and fixed by bolts. The split thread sleeve 3 is then connected and installed on the upper connector 1.

[0065] Step 6: Align the corresponding connection ends of the upper connector 1 and the double female connector 2 assembled in Step 5, install the upper connector 1 inside the double female connector 2, and rotate and adjust the upper connector 1 so that the protruding key 18 on the upper connector 1 is aligned with the groove 17 on the double female connector 2, and the protruding key 18 is fitted into the groove 17. Then, rotate the split threaded sleeve 3 relative to the double female connector 2 and the upper connector 1, tighten the threaded engagement between the split threaded sleeve 3 and the double female connector 2, and fix the upper connector 1 on the double female connector 2.

[0066] Step 7: Use external machinery to impact the positions where the inlay 10 and the mounting groove 16 are set, such as... Figure 5As shown, the anti-rotation limit is established between the upper connector 1 and the TBL drill bit 6 and the corresponding mating split thread sleeve 3 by plastic deformation of the annular surface of the anti-rotation ring 9 into the groove 11.

[0067] Step 8: Inject silicone grease into the annular space between the suspension seat 4 and the double female connector 2 through the grease injection hole 8 on the double female connector 2. After filling, seal the grease injection hole 8 with a silicone grease screw. This completes the process. Figure 1 The assembly of the suspension device for over-the-bit logging is shown.

Claims

1. A suspension device for logging through the drill bit, characterized in that, The device includes a double female connector (2), both ends of which are connected by threaded split thread sleeves (3). The two ends of the double female connector (2) are respectively connected to an upper connector (1) and a TBL drill bit (6) through the split thread sleeves (3). The surfaces of the upper connector (1) and the TBL drill bit (6) are respectively provided with inserting annular grooves (15) that cooperate with the split thread sleeves (3) along their own circumference. The split thread sleeves (3) at both ends are located in the corresponding inserting annular grooves (15) to realize the connection between the upper connector (1) and the TBL drill bit (6) and the double female connector (2). The double female connector (2) is movably connected to a suspension seat (4). Support bearings (5) are respectively sleeved on the outer side wall of the suspension seat (4) near both ends. The outer ring of the support bearing (5) is fixed to the inner wall of the double female connector (2). When the double female connector (2) rotates, the suspension seat (4) remains stationary. The split threaded sleeve (3) is an annular sleeve composed of a pair of arc-shaped pieces. The pair of arc-shaped pieces are connected by bolts. The outer side of the split threaded sleeve (3) is provided with an external thread that connects to the double female connector (2). A pair of slots (16) are opened on the outer circumference of the split threaded sleeve (3) and the upper connector (1) or TBL drill bit (6). The pair of slots (16) are symmetrically arranged along the axis of the split threaded sleeve (3). A backstop ring (9) is provided between the connecting end face of the split threaded sleeve (3) and the upper connector (1) or the TBL drill bit (6). A pair of inserts (10) that cooperate with the insert groove (16) are vertically fixed on the outer circumference of the backstop ring (9). The pair of inserts (10) are symmetrically arranged along the axis of the backstop ring (9). The inner sides of both ends of the double female connector (2) are respectively provided with grooves (17) that pass through the internal thread surface along the axial direction. The outer circumferential surface of the upper connector (1) and the TBL drill bit (6) connected to the double female connector (2) is respectively fixed with a protruding key (18). The protruding key (18) and the groove (17) are mutually adapted. The TBL drill bit (6) is provided with a protective bearing (7) in the diameter-increasing area above the central water hole. The TBL drill bit (6) is threaded with a protective bearing sleeve (13). The protective bearing sleeve (13) restricts the axial movement of the protective bearing (7). The TBL drill bit (6) is also provided with a load bearing (14) at the central water hole position. The load bearing (14) is in contact with the lower end face of the suspension seat (4). The suspension seat (4) is threaded to both ends with support bearing sleeves (12), and the support bearing sleeves (12) are tightly abutted against the support bearing (5). An annular space is formed between the suspension seat (4) and the double female connector (2). The annular space is located between the two end support bearings (5). The double female connector (2) has a grease injection hole (8) at the position opposite to the annular space.

2. The suspension device for over-the-bit logging according to claim 1, characterized in that, The upper connector (1) or TBL drill bit (6) has a pair of slots (11) on one end of the anti-reverse ring (9) along its own axial direction. The anti-reverse ring (9) is bent and embedded in the slot (11) relative to the slot (11).

3. The suspension device for over-the-bit logging according to claim 2, characterized in that, The pair of slots (11) and the pair of grooves (16) are staggered along the circumference of the device.

4. A method for assembling a suspension device for through-bit logging, characterized in that, Using the suspension device for over-the-bit logging as described in claim 3, first assemble the TBL drill bit (6), then install a support bearing (5) at one end of the suspension seat (4), assemble the TBL drill bit (6) and the suspension seat (4) with the support bearing (5) at one end, and after assembly, house the interconnected TBL drill bit (6) and suspension seat (4) inside the double female connector (2); Repeat the above assembly to assemble the other end of the upper connector (1) and the double female connector (2). After the assembly is completed, inject silicone grease into the annular space through the grease injection hole (8). Step 1: Install the protective bearing (7) in the diameter-increasing area above the central water hole of the TBL drill bit (6), and tighten the protective bearing (7) by using the threaded engagement between the protective bearing sleeve (13) and the TBL drill bit (6). Then, fix the bearing (14) in the central water hole of the TBL drill bit (6). The split threaded sleeve (3) is fitted into the inserting ring groove (15) of the TBL drill bit (6). The anti-reverse ring (9) is placed between the mating end faces of the split threaded sleeve (3) and the TBL drill bit (6). The anti-reverse ring (9) is adjusted so that the insert (10) on the anti-reverse ring (9) is aligned with the insert groove (16) opened on the split threaded sleeve (3) and partially embedded in the insert groove (16). Then, the pair of arc-shaped pieces that make up the split threaded sleeve (3) are positioned by the positioning pin and fixed by bolts. Step 2: Fit the support bearing (5) onto one end of the suspension seat (4), and tighten the support bearing (5) onto the suspension seat (4) by using the threaded engagement between the support bearing sleeve (12) and the suspension seat (4); Step 3: Align one end of the suspension seat (4) assembled in step 2 with the support bearing (5) with the corresponding connecting end of the TBL drill bit (6) assembled in step 1, and place the support bearing (5) on the connecting end of the TBL drill bit (6), and mount the lower end face of the suspension seat (4) on the bearing (14). Step 4: Fit the double female connector (2) onto the suspension seat (4) and the TBL drill bit (6), so that the suspension seat (4) is housed inside the double female connector (2). At the same time, rotate and adjust the double female connector (2) so that the groove (17) on the double female connector (2) is aligned with the protruding key (18) on the TBL drill bit (6), and make the groove (17) fit into the protruding key (18). Then rotate the split threaded sleeve (3) relative to the double female connector (2) and the TBL drill bit (6) to fix the TBL drill bit (6) onto the double female connector (2). Step 5: Fit another support bearing (5) from the port of the double female connector (2) onto the other end of the suspension seat (4). Similarly, use the support bearing sleeve (12) to tighten and press against the threaded engagement of the suspension seat (4) to fix the other support bearing (5) on the suspension seat (4). Then, another set of split threaded sleeves (3) are fitted into the inserting ring groove (15) opened on the upper connector (1). The anti-reverse ring (9) is placed between the mating end faces of the split threaded sleeve (3) and the upper connector (1). The anti-reverse ring (9) is adjusted so that the insert (10) on the anti-reverse ring (9) is aligned with the insert groove (16) opened on the split threaded sleeve (3) and partially embedded in the insert groove (16). Then, the pair of arc-shaped pieces that make up the split threaded sleeve (3) are positioned by the positioning pin and fixed by bolt connection. Step 6: Align the corresponding connecting ends of the upper connector (1) and the double female connector (2) assembled in step 5, install the upper connector (1) in the double female connector (2), and rotate and adjust the upper connector (1) so that the protruding key (18) provided on the upper connector (1) is aligned with the groove (17) opened in the double female connector (2), and make the protruding key (18) fit into the groove (17). Then rotate the split threaded sleeve (3) relative to the double female connector (2) and the TBL drill bit (6) to fix the upper connector (1) on the double female connector (2). Step 7: Use external machinery to impact the positions where the insert (10) and the groove (16) are embedded, so that the annular surface of the anti-reverse ring (9) undergoes plastic deformation that protrudes into the groove (11); Step 8: Inject silicone grease into the annular space between the suspension seat (4) and the double female connector (2) through the grease injection hole (8), and seal the grease injection hole (8) with a silicone grease screw after filling.

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